4 Molar Mass: Dumas MethodDerek EmsJon PoolTA: RachelOctober 31, 20071.Trial NumberMass of Tube (in grams)1 THROWN OUT17.6985217.7271317.7236417.7273Average Mass of gas (in grams).2565Statistical Uncertainty (in grams).002 2. ON OTHER PAGE3. The equation pv=nrt can be used to determine the pressure, volume, moles, and temperature of a given gas if the other variables are present. In this experiment pv=nrt is being used to determine the number of moles of an unknown gas. The pressure of the room was determined by reading a barometer in the room. The pressure of the barometer was listed at 79.49 cm of pressure which converts to .9933 atm. The volume of the Dumas tube was determined by weighing the tube with and without water. The difference was then calculated to be 17.7862 grams. The volume was then determined by dividing the mass over the density of the water at a certain temperature. The temperature of the room at the time was 26.8 degrees Celsius. The temperature was then rounded to 27 degrees Celsius which has a density of .